# IPhonePackager.exe RepackageFromStage Failed with UE5.6 & MacOS26.0.1 & Xcode 26.0.1 **URL:** \ **Category:** Mobile\ **Tags:** unreal-engine, iOS, question\ **Created:** [October 23, 2025, 9:57am UTC](https://forums.unrealengine.com/t/iphonepackager-exe-repackagefromstage-failed-with-ue5-6-macos26-0-1-xcode-26-0-1/2667908 "2025-10-23T09:57:08Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![thinkthen](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thinkthen](https://forums.unrealengine.com/u/thinkthen)\ **Post date:** [October 23, 2025, 9:57am UTC](https://forums.unrealengine.com/t/iphonepackager-exe-repackagefromstage-failed-with-ue5-6-macos26-0-1-xcode-26-0-1/2667908/1 "2025-10-23T09:57:08Z")
Today am upgrade macos and xcode. but remote build ios with IPhonePackager.exe RepackageFromStage Failed Saving IPA … … Writing updated Info.plist Opening source executable… … Processing one mach object (binary is thin) … Initial signature step (11.27 s elapsed so far) … Computing hashes (11.32 s elapsed so far) … Final signature step (11.93 s elapsed so far) IPP ERROR: Application exception: System.IO.InvalidDataException: CMS signature blob size is too large for the allocated size, unable to create useful code signing data 在 iPhonePackager.CodeSignatureBuilder.PerformSigning() 位置 D:\Engine\Source\Programs\IOS\iPhonePackager\CodeSigning.cs:行号 1013 在 iPhonePackager.CookTime.RepackageIPAFromStub() 位置 D:\Engine\Source\Programs\IOS\iPhonePackager\CookTime.cs:行号 355 在 iPhonePackager.Program.Main(String args) 位置 D:\Engine\Source\Programs\IOS\iPhonePackager\iPhonePackager.cs:行号 973 Anybody with the same facult. help me please ---
**Author:** ![brs-sebascova](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/brs-sebascova/32/1052483_2.png) [@brs-sebascova](https://forums.unrealengine.com/u/brs-sebascova)\ **Post date:** [October 23, 2025, 2:04pm UTC](https://forums.unrealengine.com/t/iphonepackager-exe-repackagefromstage-failed-with-ue5-6-macos26-0-1-xcode-26-0-1/2667908/2 "2025-10-23T14:04:54Z")
Hello there @thinkthen! Checking with my peers, the key error in your extract should be the following: > _IPP ERROR: Application exception: System.IO.InvalidDataException: CMS signature blob size is too large for the allocated size, unable to create useful code signing data_ This issue refers to a recent conflict between UE’s IPhonePackager and the latest versions of Xcode, as it’s signature has changed to a larger structure. When UE attempts to read the format, it can’t handle the larger signature blobs, resulting in a crash. The solution here would be to roll back your update, and go back to the previous version of Xcode you were using, until a hotfix is deployed on Epic’s end. And once you do the downgrade, please ensure that your cache’s project is cleared, either by using “Clean Build Folder”, or manually deleting folder “DerivedData”. ---
**Author:** ![thinkthen](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thinkthen](https://forums.unrealengine.com/u/thinkthen)\ **Post date:** [October 24, 2025, 2:22am UTC](https://forums.unrealengine.com/t/iphonepackager-exe-repackagefromstage-failed-with-ue5-6-macos26-0-1-xcode-26-0-1/2667908/3 "2025-10-24T02:22:05Z")
first, thanks for you reply. am attep to use the macos26 and old xcode16.2 with the same situation. cd /Users/oooo/UE5/Builds/PC-2025RLHYJB/D/D:/Intermediate/ProjectFilesIOS /Applications/Xcode.app/Contents/Developer/usr/bin/actool --output-format human-readable-text --notices --warnings --export-dependency-info /\* com.apple.actool.errors _/ /Users/oooo/UE5/Builds/PC-2025RLHYJB/D/D:/UnrealEngine/Engine/Build/IOS/Resources/Assets.xcassets: error: Failed to launch AssetCatalogSimulatorAgent via CoreSimulator spawn Underlying Errors: Description: Failed to handshake with platform tool Failure Reason: Failed to open connection over FIFOs with platform tool Underlying Errors: Description: Recovery Suggestion: Try restarting your computer Underlying Errors: Description: Failed to open FIFOs for handshaking with platform tool Failure Reason: AssetCatalogSimulatorAgent exited before we could handshake /_ com.apple.actool.compilation-results \*/ ---
**Author:** ![thinkthen](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thinkthen](https://forums.unrealengine.com/u/thinkthen)\ **Post date:** [November 10, 2025, 3:53am UTC](https://forums.unrealengine.com/t/iphonepackager-exe-repackagefromstage-failed-with-ue5-6-macos26-0-1-xcode-26-0-1/2667908/4 "2025-11-10T03:53:15Z")
Revision: 5f30d8f91dee499ab2576d65dd5dd2025b8127ba Author: stephane jacoby [stephane.jacoby@epicgames.com](mailto:stephane.jacoby@epicgames.com) Date: 2025/11/6 2:17:29 Message: In remote iOS build, ensure that Provision Profiles folder is created prior to installing the Windows specified provisioning profile on the remote mac. Work around new MacOS 26 codesigning CMS blob size errors by no longer enforcing that replacement signature on Windows be done in place of the one generated on MacOS as the size of these no longer match. This involves restoring the old code that was offsetting the \_\_LINKEDIT section to accomodate changes in the size of the LC\_CODE\_SIGNATURE section. #jira UE-352509 #rb Josh.Adams, adam.kinge, Sergio.Gardeazabal, zack.neyland ## [CL 47861747 by stephane jacoby in ue5-main branch] Modified: Engine/Build/Commit.gitdeps.xml Modified: Engine/Source/Programs/IOS/iPhonePackager/CodeSigning.cs Modified: Engine/Source/Programs/UnrealBuildTool/Platform/Apple/AppleToolChain.cs Modified: Engine/Source/Programs/UnrealBuildTool/Platform/IOS/IOSToolChain.cs ---
**Author:** ![thinkthen](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@thinkthen](https://forums.unrealengine.com/u/thinkthen)\ **Post date:** [November 10, 2025, 3:54am UTC](https://forums.unrealengine.com/t/iphonepackager-exe-repackagefromstage-failed-with-ue5-6-macos26-0-1-xcode-26-0-1/2667908/5 "2025-11-10T03:54:34Z")
Thanks stephane jacoby very much.